I have no idea why but online is soo hard. I get like 4 kills and 24 deaths. Can anybody give me any tips?

Go for headshots and If they get up close use the knife. Dont go running blindly into a firefight.

I suggest you try and stay with at least 1 teammate and face different directions. This way you can see in front and in back. Good tactic!

when im runnin around a person tryin to knife him , he always knifes me wven when i press rt and it tells me to.

Make sure you wait until you lift your knife. I did that mistake many times before which ended bad. "Patience is a virtue"

What do you mean?? Can you keep your knife in the air and then when your near strike it?

When the RT symbol comes up you have to wait for your guy to raise your knife. Then you can kill the enemy.

Oh ok , I still dont see how it can help me.